gsxr - great tutorial on pod replacement. It was tedious & frustrating (6 hours) but my vents are now all blowing properly. 4 pods were bad. I have a few additional questions that relate to my goal of having a properly functioning ac system.

1. How can I tell if my evaporator is bad? I don't want to reassemble the dash if it's bad.
2. How do I test for no freon leaks on my 134 ac system? Can I use my trusted Might Vac? I've got to replace the receiver / drier (INDY shop charged system a year ago I told me that's why it gets cool but not cold) because it's not blowing cold & thus replace freon but I wanted to test for leaks prior to removing rec./drier.
3. I can spin the front wheel of the compressor so I'm assuming it's good. Can I add compressor oil without removing the compressor? How do you know if the compressor is engaging.
4. Should I go ahead & replace the expansion valve also? I think it's the original but not sure?

Sorry to pepper you with random questions. I've read a number of post on how to charge system but this will be my first full ac rebuild & thus I'm a little lost. Not to mention I truely don't understand the function of all the various main components (rec./drier, exp. valve, evap, freon, comp., etc) that make up an ac system.